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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae8af7accb27d20a7d38adee1509a0766e63b1bbca3bcc163f8052211ef5b5b' 
  AND token = 'BrTQe3N/pZbvFu2XM1znebviSolp10chJ3QfliiHrkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}